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                    2-1 Entry
            
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                    2-2 Output
            
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                    2-3 Module
            
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                    2-4 Resolve
            
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                    2-5 Plugins
            
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                    2-6 DevServer
            
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                    2-7 其它配置项
            
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                    2-8 整体配置结构
            
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                    2-9 多种配置类型
            
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                    2-10 配置总结
            
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                    3-1 使用 ES6 语言
            
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                    3-2 使用 TypeScript 语言
            
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                    3-3 使用 Flow 检查器
            
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                    3-4 使用 SCSS
            
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                    3-10 管理多个单页应用
            
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                    3-11 构建同构应用
            
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                    3-15 搭配 Npm Script
            
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                    3-16 检查代码
            
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                    3-17 通过 Node.js API 启动 Webpack
            
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                    3-18 使用 Webpack Dev Middleware
            
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                    3-19 加载图片
            
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                    3-20 加载SVG
            
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                    3-21 加载 Source Map
            
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                    3-22 实战总结
            
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                    4-2 使用 DllPlugin
            
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                    4-3 使用 HappyPack
            
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                    4-6 开启模块热替换
            
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                    4-7 区分环境
            
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                    4-8 压缩代码
            
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                    4-9 CDN 加速
            
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                    4-10 使用 Tree Shaking
            
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                    4-11 提取公共代码
            
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                    4-12 按需加载
            
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                    4-13 使用 Prepack
            
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                    4-14 开启 Scope Hoisting
            
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                    4-15 输出分析
            
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                    4-16 优化总结
            
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                    第5章 原理
            
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                    5-1 工作原理概括
            
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                    5-2 输出文件分析
            
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                    5-3 编写 Loader
            
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                    5-4 编写 Plugin
            
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                    5-5 调试 Webpack
            
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                    5-6 原理总结
            
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                    常用 Loaders
            
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                    常用 Plugins
            
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                                <section class="normal markdown-section">
                                
                                <h1 id="4-6-&#x5F00;&#x542F;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;">4-6 &#x5F00;&#x542F;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;</h1>
<p>&#x8981;&#x505A;&#x5230;&#x5B9E;&#x65F6;&#x9884;&#x89C8;&#xFF0C;&#x9664;&#x4E86;&#x5728;<a href="4-5&#x4F7F;&#x7528;&#x81EA;&#x52A8;&#x5237;&#x65B0;.html">4-5&#x4F7F;&#x7528;&#x81EA;&#x52A8;&#x5237;&#x65B0;</a>&#x4E2D;&#x4ECB;&#x7ECD;&#x7684;&#x5237;&#x65B0;&#x6574;&#x4E2A;&#x7F51;&#x9875;&#x5916;&#xFF0C;DevServer &#x8FD8;&#x652F;&#x6301;&#x4E00;&#x79CD;&#x53EB;&#x505A;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;(Hot Module Replacement)&#x7684;&#x6280;&#x672F;&#x53EF;&#x5728;&#x4E0D;&#x5237;&#x65B0;&#x6574;&#x4E2A;&#x7F51;&#x9875;&#x7684;&#x60C5;&#x51B5;&#x4E0B;&#x505A;&#x5230;&#x8D85;&#x7075;&#x654F;&#x7684;&#x5B9E;&#x65F6;&#x9884;&#x89C8;&#x3002;
&#x539F;&#x7406;&#x662F;&#x5F53;&#x4E00;&#x4E2A;&#x6E90;&#x7801;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#xFF0C;&#x53EA;&#x91CD;&#x65B0;&#x7F16;&#x8BD1;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x7684;&#x6A21;&#x5757;&#xFF0C;&#x518D;&#x7528;&#x65B0;&#x8F93;&#x51FA;&#x7684;&#x6A21;&#x5757;&#x66FF;&#x6362;&#x6389;&#x6D4F;&#x89C8;&#x5668;&#x4E2D;&#x5BF9;&#x5E94;&#x7684;&#x8001;&#x6A21;&#x5757;&#x3002;</p>
<p>&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x6280;&#x672F;&#x7684;&#x4F18;&#x52BF;&#x6709;&#xFF1A;</p>
<ul>
<li>&#x5B9E;&#x65F6;&#x9884;&#x89C8;&#x53CD;&#x5E94;&#x66F4;&#x5FEB;&#xFF0C;&#x7B49;&#x5F85;&#x65F6;&#x95F4;&#x66F4;&#x77ED;&#x3002;</li>
<li>&#x4E0D;&#x5237;&#x65B0;&#x6D4F;&#x89C8;&#x5668;&#x80FD;&#x4FDD;&#x7559;&#x5F53;&#x524D;&#x7F51;&#x9875;&#x7684;&#x8FD0;&#x884C;&#x72B6;&#x6001;&#xFF0C;&#x4F8B;&#x5982;&#x5728;&#x4F7F;&#x7528; Redux &#x6765;&#x7BA1;&#x7406;&#x6570;&#x636E;&#x7684;&#x5E94;&#x7528;&#x4E2D;&#x642D;&#x914D;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x80FD;&#x505A;&#x5230;&#x4EE3;&#x7801;&#x66F4;&#x65B0;&#x65F6; Redux &#x4E2D;&#x7684;&#x6570;&#x636E;&#x8FD8;&#x4FDD;&#x6301;&#x4E0D;&#x53D8;&#x3002;</li>
</ul>
<p>&#x603B;&#x7684;&#x6765;&#x8BF4;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x6280;&#x672F;&#x5F88;&#x5927;&#x7A0B;&#x5EA6;&#x4E0A;&#x7684;&#x63D0;&#x9AD8;&#x4E86;&#x5F00;&#x53D1;&#x6548;&#x7387;&#x548C;&#x4F53;&#x9A8C;&#x3002;</p>
<h2 id="&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x7684;&#x539F;&#x7406;">&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x7684;&#x539F;&#x7406;</h2>
<p>&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x7684;&#x539F;&#x7406;&#x548C;&#x81EA;&#x52A8;&#x5237;&#x65B0;&#x539F;&#x7406;&#x7C7B;&#x4F3C;&#xFF0C;&#x90FD;&#x9700;&#x8981;&#x5F80;&#x8981;&#x5F00;&#x53D1;&#x7684;&#x7F51;&#x9875;&#x4E2D;&#x6CE8;&#x5165;&#x4E00;&#x4E2A;&#x4EE3;&#x7406;&#x5BA2;&#x6237;&#x7AEF;&#x7528;&#x4E8E;&#x8FDE;&#x63A5; DevServer &#x548C;&#x7F51;&#x9875;&#xFF0C;
&#x4E0D;&#x540C;&#x5728;&#x4E8E;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x72EC;&#x7279;&#x7684;&#x6A21;&#x5757;&#x66FF;&#x6362;&#x673A;&#x5236;&#x3002;</p>
<p>DevServer &#x9ED8;&#x8BA4;&#x4E0D;&#x4F1A;&#x5F00;&#x542F;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x6A21;&#x5F0F;&#xFF0C;&#x8981;&#x5F00;&#x542F;&#x8BE5;&#x6A21;&#x5F0F;&#xFF0C;&#x53EA;&#x9700;&#x5728;&#x542F;&#x52A8;&#x65F6;&#x5E26;&#x4E0A;&#x53C2;&#x6570; <code>--hot</code>&#xFF0C;&#x5B8C;&#x6574;&#x547D;&#x4EE4;&#x662F; <code>webpack-dev-server --hot</code>&#x3002;</p>
<blockquote>
<p>&#x9664;&#x4E86;&#x901A;&#x8FC7;&#x5728;&#x542F;&#x52A8;&#x65F6;&#x5E26;&#x4E0A; <code>--hot</code> &#x53C2;&#x6570;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x63A5;&#x5165; Plugin &#x5B9E;&#x73B0;&#xFF0C;&#x76F8;&#x5173;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> HotModuleReplacementPlugin = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;webpack/lib/HotModuleReplacementPlugin&apos;</span>);

<span class="hljs-built_in">module</span>.exports = {
  entry:{
    <span class="hljs-comment">// &#x4E3A;&#x6BCF;&#x4E2A;&#x5165;&#x53E3;&#x90FD;&#x6CE8;&#x5165;&#x4EE3;&#x7406;&#x5BA2;&#x6237;&#x7AEF;</span>
    main:[<span class="hljs-string">&apos;webpack-dev-server/client?http://localhost:8080/&apos;</span>, <span class="hljs-string">&apos;webpack/hot/dev-server&apos;</span>,<span class="hljs-string">&apos;./src/main.js&apos;</span>],
  },
  plugins: [
    <span class="hljs-comment">// &#x8BE5;&#x63D2;&#x4EF6;&#x7684;&#x4F5C;&#x7528;&#x5C31;&#x662F;&#x5B9E;&#x73B0;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#xFF0C;&#x5B9E;&#x9645;&#x4E0A;&#x5F53;&#x542F;&#x52A8;&#x65F6;&#x5E26;&#x4E0A; `--hot` &#x53C2;&#x6570;&#xFF0C;&#x4F1A;&#x6CE8;&#x5165;&#x8BE5;&#x63D2;&#x4EF6;&#xFF0C;&#x751F;&#x6210; .hot-update.json &#x6587;&#x4EF6;&#x3002;</span>
    <span class="hljs-keyword">new</span> HotModuleReplacementPlugin(),
  ],
  devServer:{
    <span class="hljs-comment">// &#x544A;&#x8BC9; DevServer &#x8981;&#x5F00;&#x542F;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x6A21;&#x5F0F;</span>
    hot: <span class="hljs-literal">true</span>,      
  }  
};
</code></pre>
<p>&#x5728;&#x542F;&#x52A8; Webpack &#x65F6;&#x5E26;&#x4E0A;&#x53C2;&#x6570; <code>--hot</code> &#x5176;&#x5B9E;&#x5C31;&#x662F;&#x81EA;&#x52A8;&#x4E3A;&#x4F60;&#x5B8C;&#x6210;&#x4EE5;&#x4E0A;&#x914D;&#x7F6E;&#x3002;</p>
</blockquote>
<p>&#x542F;&#x52A8;&#x540E;&#x65E5;&#x5FD7;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code>&gt; webpack-dev-server --hot

Project is running at http://localhost:8080/
webpack output is served from /
webpack: wait until bundle finished: /
webpack: wait until bundle finished: /bundle.js
Hash: fe62ac6b753c1d98961b
Version: webpack 3.5.5
Time: 3563ms
        Asset     Size  Chunks                    Chunk Names
    bundle.js  1.11 MB       0  [emitted]  [big]  main
bundle.js.map  1.33 MB       0  [emitted]         main
  [50] (webpack)/hot/log.js 1.04 kB {0} [built]
 [118] multi (webpack)-dev-server/client?http://localhost:8080 webpack/hot/dev-server ./main.js 52 bytes {0} [built]
 [119] (webpack)-dev-server/client?http://localhost:8080 5.83 kB {0} [built]
 [120] ./node_modules/url/url.js 23.3 kB {0} [built]
 [126] ./node_modules/strip-ansi/index.js 161 bytes {0} [built]
 [128] ./node_modules/loglevel/lib/loglevel.js 6.74 kB {0} [built]
 [129] (webpack)-dev-server/client/socket.js 856 bytes {0} [built]
 [161] (webpack)-dev-server/client/overlay.js 3.6 kB {0} [built]
 [166] (webpack)/hot nonrecursive ^\.\/log$ 170 bytes {0} [built]
 [168] (webpack)/hot/dev-server.js 1.61 kB {0} [built]
 [169] (webpack)/hot/log-apply-result.js 1.31 kB {0} [built]
 [170] ./main.js 2.35 kB {0} [built]
    + 262 hidden modules
</code></pre><p>&#x53EF;&#x4EE5;&#x770B;&#x51FA; <code>bundle.js</code> &#x4EE3;&#x7406;&#x5BA2;&#x6237;&#x7AEF;&#x76F8;&#x5173;&#x7684;&#x4EE3;&#x7801;&#x5305;&#x542B;&#x4E5D;&#x4E2A;&#x6587;&#x4EF6;&#xFF1A;</p>
<pre><code> [119] (webpack)-dev-server/client?http://localhost:8080 5.83 kB {0} [built]
 [120] ./node_modules/url/url.js 23.3 kB {0} [built]
 [126] ./node_modules/strip-ansi/index.js 161 bytes {0} [built]
 [128] ./node_modules/loglevel/lib/loglevel.js 6.74 kB {0} [built] 
 [129] (webpack)-dev-server/client/socket.js 856 bytes {0} [built]
 [161] (webpack)-dev-server/client/overlay.js 3.6 kB {0} [built]
 [166] (webpack)/hot nonrecursive ^\.\/log$ 170 bytes {0} [built]
 [168] (webpack)/hot/dev-server.js 1.61 kB {0} [built]
 [169] (webpack)/hot/log-apply-result.js 1.31 kB {0} [built]
</code></pre><p>&#x76F8;&#x6BD4;&#x4E8E;&#x81EA;&#x52A8;&#x5237;&#x65B0;&#x7684;&#x4EE3;&#x7406;&#x5BA2;&#x6237;&#x7AEF;&#xFF0C;&#x591A;&#x51FA;&#x4E86;&#x540E;&#x4E09;&#x4E2A;&#x7528;&#x4E8E;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x7684;&#x6587;&#x4EF6;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#x4EE3;&#x7406;&#x5BA2;&#x6237;&#x7AEF;&#x66F4;&#x5927;&#x4E86;&#x3002;</p>
<p>&#x4FEE;&#x6539;&#x6E90;&#x7801; <code>main.css</code> &#x6587;&#x4EF6;&#x540E;&#xFF0C;&#x65B0;&#x8F93;&#x51FA;&#x4E86;&#x5982;&#x4E0B;&#x65E5;&#x5FD7;&#xFF1A;</p>
<pre><code>webpack: Compiling...
Hash: 18f81c959118f6230623
Version: webpack 3.5.5
Time: 551ms
                                   Asset       Size  Chunks                    Chunk Names
                               bundle.js    1.11 MB       0  [emitted]  [big]  main
    0.ea11a51f97f2b52bca7d.hot-update.js  353 bytes       0  [emitted]         main
    ea11a51f97f2b52bca7d.hot-update.json   43 bytes          [emitted]         
                           bundle.js.map    1.33 MB       0  [emitted]         main
0.ea11a51f97f2b52bca7d.hot-update.js.map  577 bytes       0  [emitted]         main
  [68] ./node_modules/css-loader!./main.css 217 bytes {0} [built]
 [166] (webpack)/hot nonrecursive ^\.\/log$ 170 bytes {0} [built]
    + 275 hidden modules
webpack: Compiled successfully.
</code></pre><p>DevServer &#x65B0;&#x751F;&#x6210;&#x4E86;&#x4E00;&#x4E2A;&#x7528;&#x4E8E;&#x66FF;&#x6362;&#x8001;&#x6A21;&#x5757;&#x7684;&#x8865;&#x4E01;&#x6587;&#x4EF6; <code>0.ea11a51f97f2b52bca7d.hot-update.js</code>&#xFF0C;&#x540C;&#x65F6;&#x5728;&#x6D4F;&#x89C8;&#x5668;&#x5F00;&#x53D1;&#x5DE5;&#x5177;&#x4E2D;&#x4E5F;&#x80FD;&#x770B;&#x5230;&#x8BF7;&#x6C42;&#x8FD9;&#x4E2A;&#x8865;&#x4E01;&#x7684;&#x6293;&#x5305;&#xFF1A;</p>
<p><img src="img/4-6hot-patch.png" alt="&#x56FE;4.5.3 &#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x6A21;&#x5F0F;&#x4E0B;&#x7684;&#x8865;&#x4E01;"></p>
<p>&#x53EF;&#x89C1;&#x8865;&#x4E01;&#x4E2D;&#x5305;&#x542B;&#x4E86; <code>main.css</code> &#x6587;&#x4EF6;&#x65B0;&#x7F16;&#x8BD1;&#x51FA;&#x6765; CSS &#x4EE3;&#x7801;&#xFF0C;&#x7F51;&#x9875;&#x4E2D;&#x7684;&#x6837;&#x5F0F;&#x4E5F;&#x7ACB;&#x523B;&#x53D8;&#x6210;&#x4E86;&#x6E90;&#x7801;&#x4E2D;&#x63CF;&#x8FF0;&#x7684;&#x90A3;&#x6837;&#x3002;</p>
<p>&#x4F46;&#x5F53;&#x4F60;&#x4FEE;&#x6539; <code>main.js</code> &#x6587;&#x4EF6;&#x65F6;&#xFF0C;&#x4F1A;&#x53D1;&#x73B0;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x6CA1;&#x6709;&#x751F;&#x6548;&#xFF0C;&#x800C;&#x662F;&#x6574;&#x4E2A;&#x9875;&#x9762;&#x88AB;&#x5237;&#x65B0;&#x4E86;&#xFF0C;&#x4E3A;&#x4EC0;&#x4E48;&#x4FEE;&#x6539; <code>main.js</code> &#x6587;&#x4EF6;&#x65F6;&#x4F1A;&#x8FD9;&#x6837;&#x5462;&#xFF1F;</p>
<p>Webpack &#x4E3A;&#x4E86;&#x8BA9;&#x4F7F;&#x7528;&#x8005;&#x5728;&#x4F7F;&#x7528;&#x4E86;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x529F;&#x80FD;&#x65F6;&#x80FD;&#x7075;&#x6D3B;&#x5730;&#x63A7;&#x5236;&#x8001;&#x6A21;&#x5757;&#x88AB;&#x66FF;&#x6362;&#x65F6;&#x7684;&#x903B;&#x8F91;&#xFF0C;&#x53EF;&#x4EE5;&#x5728;&#x6E90;&#x7801;&#x4E2D;&#x5B9A;&#x4E49;&#x4E00;&#x4E9B;&#x4EE3;&#x7801;&#x53BB;&#x505A;&#x76F8;&#x5E94;&#x7684;&#x5904;&#x7406;&#x3002;</p>
<p>&#x628A;&#x7684; <code>main.js</code> &#x6587;&#x4EF6;&#x6539;&#x4E3A;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">import</span> React <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;react&apos;</span>;
<span class="hljs-keyword">import</span> { render } <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;react-dom&apos;</span>;
<span class="hljs-keyword">import</span> { AppComponent } <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./AppComponent&apos;</span>;
<span class="hljs-keyword">import</span> <span class="hljs-string">&apos;./main.css&apos;</span>;

render(<span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">AppComponent</span>/&gt;</span></span>, <span class="hljs-built_in">window</span>.document.getElementById(<span class="hljs-string">&apos;app&apos;</span>));

<span class="hljs-comment">// &#x53EA;&#x6709;&#x5F53;&#x5F00;&#x542F;&#x4E86;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x65F6; module.hot &#x624D;&#x5B58;&#x5728;</span>
<span class="hljs-keyword">if</span> (<span class="hljs-built_in">module</span>.hot) {
  <span class="hljs-comment">// accept &#x51FD;&#x6570;&#x7684;&#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x6307;&#x51FA;&#x5F53;&#x524D;&#x6587;&#x4EF6;&#x63A5;&#x53D7;&#x54EA;&#x4E9B;&#x5B50;&#x6A21;&#x5757;&#x7684;&#x66FF;&#x6362;&#xFF0C;&#x8FD9;&#x91CC;&#x8868;&#x793A;&#x53EA;&#x63A5;&#x53D7; ./AppComponent &#x8FD9;&#x4E2A;&#x5B50;&#x6A21;&#x5757;</span>
  <span class="hljs-comment">// &#x7B2C;2&#x4E2A;&#x53C2;&#x6570;&#x7528;&#x4E8E;&#x5728;&#x65B0;&#x7684;&#x5B50;&#x6A21;&#x5757;&#x52A0;&#x8F7D;&#x5B8C;&#x6BD5;&#x540E;&#x9700;&#x8981;&#x6267;&#x884C;&#x7684;&#x903B;&#x8F91;</span>
  <span class="hljs-built_in">module</span>.hot.accept([<span class="hljs-string">&apos;./AppComponent&apos;</span>], () =&gt; {
    <span class="hljs-comment">// &#x65B0;&#x7684; AppComponent &#x52A0;&#x8F7D;&#x6210;&#x529F;&#x540E;&#x91CD;&#x65B0;&#x6267;&#x884C;&#x4E0B;&#x7EC4;&#x5EFA;&#x6E32;&#x67D3;&#x903B;&#x8F91;</span>
    render(<span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">AppComponent</span>/&gt;</span></span>, <span class="hljs-built_in">window</span>.document.getElementById(<span class="hljs-string">&apos;app&apos;</span>));
  });
}
</code></pre>
<p>&#x5176;&#x4E2D;&#x7684; <code>module.hot</code> &#x662F;&#x5F53;&#x5F00;&#x542F;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x540E;&#x6CE8;&#x5165;&#x5230;&#x5168;&#x5C40;&#x7684; API&#xFF0C;&#x7528;&#x4E8E;&#x63A7;&#x5236;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x7684;&#x903B;&#x8F91;&#x3002;</p>
<p>&#x73B0;&#x5728;&#x4FEE;&#x6539; <code>AppComponent.js</code> &#x6587;&#x4EF6;&#xFF0C;&#x628A; <code>Hello,Webpack</code> &#x6539;&#x6210; <code>Hello,World</code>&#xFF0C;&#x4F60;&#x4F1A;&#x53D1;&#x73B0;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x751F;&#x6548;&#x4E86;&#x3002;
&#x4F46;&#x662F;&#x5F53;&#x4F60;&#x7F16;&#x8F91; <code>main.js</code> &#x65F6;&#xFF0C;&#x4F60;&#x4F1A;&#x53D1;&#x73B0;&#x6574;&#x4E2A;&#x7F51;&#x9875;&#x88AB;&#x5237;&#x65B0;&#x4E86;&#x3002;&#x4E3A;&#x4EC0;&#x4E48;&#x4FEE;&#x6539;&#x8FD9;&#x4E24;&#x4E2A;&#x6587;&#x4EF6;&#x4F1A;&#x6709;&#x4E0D;&#x4E00;&#x6837;&#x7684;&#x8868;&#x73B0;&#x5462;&#xFF1F;</p>
<p>&#x5F53;&#x5B50;&#x6A21;&#x5757;&#x53D1;&#x751F;&#x66F4;&#x65B0;&#x65F6;&#xFF0C;&#x66F4;&#x65B0;&#x4E8B;&#x4EF6;&#x4F1A;&#x4E00;&#x5C42;&#x5C42;&#x5F80;&#x4E0A;&#x4F20;&#x9012;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x4ECE; <code>AppComponent.js</code> &#x6587;&#x4EF6;&#x4F20;&#x9012;&#x5230; <code>main.js</code> &#x6587;&#x4EF6;&#xFF0C;
&#x76F4;&#x5230;&#x6709;&#x67D0;&#x5C42;&#x7684;&#x6587;&#x4EF6;&#x63A5;&#x53D7;&#x4E86;&#x5F53;&#x524D;&#x53D8;&#x5316;&#x7684;&#x6A21;&#x5757;&#xFF0C;&#x4E5F;&#x5C31;&#x662F; <code>main.js</code> &#x6587;&#x4EF6;&#x4E2D;&#x5B9A;&#x4E49;&#x7684; <code>module.hot.accept([&apos;./AppComponent&apos;], callback)</code>&#xFF0C;
&#x8FD9;&#x65F6;&#x5C31;&#x4F1A;&#x8C03;&#x7528; <code>callback</code> &#x51FD;&#x6570;&#x53BB;&#x6267;&#x884C;&#x81EA;&#x5B9A;&#x4E49;&#x903B;&#x8F91;&#x3002;&#x5982;&#x679C;&#x4E8B;&#x4EF6;&#x4E00;&#x76F4;&#x5F80;&#x4E0A;&#x629B;&#x5230;&#x6700;&#x5916;&#x5C42;&#x90FD;&#x6CA1;&#x6709;&#x6587;&#x4EF6;&#x63A5;&#x53D7;&#x5B83;&#xFF0C;&#x5C31;&#x4F1A;&#x76F4;&#x63A5;&#x5237;&#x65B0;&#x7F51;&#x9875;&#x3002;</p>
<p>&#x90A3;&#x4E3A;&#x4EC0;&#x4E48;&#x6CA1;&#x6709;&#x5730;&#x65B9;&#x63A5;&#x53D7;&#x8FC7; <code>.css</code> &#x6587;&#x4EF6;&#xFF0C;&#x4F46;&#x662F;&#x4FEE;&#x6539;&#x6240;&#x6709;&#x7684; <code>.css</code> &#x6587;&#x4EF6;&#x90FD;&#x4F1A;&#x89E6;&#x53D1;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x5462;&#xFF1F;
&#x539F;&#x56E0;&#x5728;&#x4E8E; <code>style-loader</code> &#x4F1A;&#x6CE8;&#x5165;&#x7528;&#x4E8E;&#x63A5;&#x53D7; CSS &#x7684;&#x4EE3;&#x7801;&#x3002;</p>
<blockquote>
<p>&#x8BF7;&#x4E0D;&#x8981;&#x628A;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x6280;&#x672F;&#x7528;&#x4E8E;&#x7EBF;&#x4E0A;&#x73AF;&#x5883;&#xFF0C;&#x5B83;&#x662F;&#x4E13;&#x95E8;&#x4E3A;&#x63D0;&#x5347;&#x5F00;&#x53D1;&#x6548;&#x7387;&#x751F;&#x7684;&#x3002;</p>
</blockquote>
<h2 id="&#x4F18;&#x5316;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;">&#x4F18;&#x5316;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;</h2>
<p>&#x5728;&#x53D1;&#x751F;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x65F6;&#xFF0C;&#x4F60;&#x4F1A;&#x5728;&#x6D4F;&#x89C8;&#x5668;&#x7684;&#x63A7;&#x5236;&#x53F0;&#x4E2D;&#x770B;&#x5230;&#x7C7B;&#x4F3C;&#x8FD9;&#x6837;&#x7684;&#x65E5;&#x5FD7;&#xFF1A;</p>
<p><img src="img/4-6hmr-log.png" alt="&#x56FE;4.5.4 &#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x6D4F;&#x89C8;&#x5668;&#x65E5;&#x5FD7;"></p>
<p>&#x5176;&#x4E2D;&#x7684; <code>Updated modules: 68</code> &#x662F;&#x6307; ID &#x4E3A;68&#x7684;&#x6A21;&#x5757;&#x88AB;&#x66FF;&#x6362;&#x4E86;&#xFF0C;&#x8FD9;&#x5BF9;&#x5F00;&#x53D1;&#x8005;&#x6765;&#x8BF4;&#x5F88;&#x4E0D;&#x53CB;&#x597D;&#xFF0C;&#x56E0;&#x4E3A;&#x5F00;&#x53D1;&#x8005;&#x4E0D;&#x77E5;&#x9053; ID &#x548C;&#x6A21;&#x5757;&#x4E4B;&#x95F4;&#x7684;&#x5BF9;&#x5E94;&#x5173;&#x7CFB;&#xFF0C;&#x6700;&#x597D;&#x662F;&#x628A;&#x66FF;&#x6362;&#x4E86;&#x7684;&#x6A21;&#x5757;&#x7684;&#x540D;&#x79F0;&#x8F93;&#x51FA;&#x51FA;&#x6765;&#x3002;
Webpack &#x5185;&#x7F6E;&#x7684; NamedModulesPlugin &#x63D2;&#x4EF6;&#x53EF;&#x4EE5;&#x89E3;&#x51B3;&#x8BE5;&#x95EE;&#x9898;&#xFF0C;&#x4FEE;&#x6539; Webpack &#x914D;&#x7F6E;&#x6587;&#x4EF6;&#x63A5;&#x5165;&#x8BE5;&#x63D2;&#x4EF6;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> NamedModulesPlugin = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;webpack/lib/NamedModulesPlugin&apos;</span>);

<span class="hljs-built_in">module</span>.exports = {
  plugins: [
    <span class="hljs-comment">// &#x663E;&#x793A;&#x51FA;&#x88AB;&#x66FF;&#x6362;&#x6A21;&#x5757;&#x7684;&#x540D;&#x79F0;</span>
    <span class="hljs-keyword">new</span> NamedModulesPlugin(),
  ],
};
</code></pre>
<p>&#x91CD;&#x542F;&#x6784;&#x5EFA;&#x540E;&#x4F60;&#x4F1A;&#x53D1;&#x73B0;&#x6D4F;&#x89C8;&#x5668;&#x4E2D;&#x7684;&#x65E5;&#x5FD7;&#x66F4;&#x52A0;&#x53CB;&#x597D;&#x4E86;&#xFF1A;</p>
<p><img src="img/4-6hmr-log-named.png" alt="&#x56FE;4.5.4 &#x73B0;&#x5B9E;&#x51FA;&#x88AB;&#x66FF;&#x6362;&#x6A21;&#x5757;&#x7684;&#x6D4F;&#x89C8;&#x5668;&#x65E5;&#x5FD7;"></p>
<p>&#x9664;&#x6B64;&#x4E4B;&#x5916;&#xFF0C;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x8FD8;&#x9762;&#x4E34;&#x7740;&#x548C;&#x81EA;&#x52A8;&#x5237;&#x65B0;&#x4E00;&#x6837;&#x7684;&#x6027;&#x80FD;&#x95EE;&#x9898;&#xFF0C;&#x56E0;&#x4E3A;&#x5B83;&#x4EEC;&#x90FD;&#x9700;&#x8981;&#x76D1;&#x542C;&#x6587;&#x4EF6;&#x53D8;&#x5316;&#x548C;&#x6CE8;&#x5165;&#x5BA2;&#x6237;&#x7AEF;&#x3002;
&#x8981;&#x4F18;&#x5316;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x7684;&#x6784;&#x5EFA;&#x6027;&#x80FD;&#xFF0C;&#x601D;&#x8DEF;&#x548C;&#x5728;<a href="4-5&#x4F7F;&#x7528;&#x81EA;&#x52A8;&#x5237;&#x65B0;.html">4-5 &#x4F7F;&#x7528;&#x81EA;&#x52A8;&#x5237;&#x65B0;</a>&#x4E2D;&#x63D0;&#x5230;&#x7684;&#x5F88;&#x7C7B;&#x4F3C;&#xFF1A;&#x76D1;&#x542C;&#x66F4;&#x5C11;&#x7684;&#x6587;&#x4EF6;&#xFF0C;&#x5FFD;&#x7565;&#x6389; <code>node_modules</code> &#x76EE;&#x5F55;&#x4E0B;&#x7684;&#x6587;&#x4EF6;&#x3002;
&#x4F46;&#x662F;&#x5176;&#x4E2D;&#x63D0;&#x5230;&#x7684;&#x5173;&#x95ED;&#x9ED8;&#x8BA4;&#x7684; inline &#x6A21;&#x5F0F;&#x624B;&#x52A8;&#x6CE8;&#x5165;&#x4EE3;&#x7406;&#x5BA2;&#x6237;&#x7AEF;&#x7684;&#x4F18;&#x5316;&#x65B9;&#x6CD5;&#x4E0D;&#x80FD;&#x7528;&#x4E8E;&#x5728;&#x4F7F;&#x7528;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x7684;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;
&#x539F;&#x56E0;&#x5728;&#x4E8E;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x7684;&#x8FD0;&#x884C;&#x4F9D;&#x8D56;&#x5728;&#x6BCF;&#x4E2A; Chunk &#x4E2D;&#x90FD;&#x5305;&#x542B;&#x4EE3;&#x7406;&#x5BA2;&#x6237;&#x7AEF;&#x7684;&#x4EE3;&#x7801;&#x3002;</p>

                                
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